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I am assuming you are asking about synthetic aperture RADAR antennas. In general they are one directional. Otherwise they would give ambiguous results by adding the images from both sides. On aircraft they are on the sides of the fuselage and only image to one side.
while it is true that phased array are often employed for SAR applications, expecially for they steering capability in spotlight-mode, it is not true that reflector cannot be used in SAR.
An example of SAR reflector is embarked on the Cassini spacecraft that btw is arriving to Saturn in these days.
Another SAR with a reflector antenna was the Magellan mission to Venus (1990). The same reflector was used for the SAR and for communications with earth.
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